P01F2

O2 Sensor Circuit Low Voltage Bank 1 Sensor 4

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Increased fuel consumption
Unstable engine operation
Check Engine light comes on
Increased emissions of harmful substances

Causes

Oxygen sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Grounding problems
Engine ECU malfunction

How to Fix

Check the integrity of the sensor wiring and connectors
Check sensor circuit grounding
Replace the oxygen sensor if necessary
Check the operation of the engine ECU

Related codes

P0138 P0140 P0141